/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.maven.index.artifact;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import java.io.File;
  import java.io.FileInputStream;
  import java.io.IOException;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Properties;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * A very simple artifact packaging mapper, that has everything for quick-start wired in this class. Also, it takes into
   * account the "${nexus-work}/conf/packaging2extension-mapping.properties" file into account if found. To override the
   * "defaults" in this class, simply add lines to properties file with same keys.
   *
   * @author cstamas
   */
  @Singleton
  @Named
  public class DefaultArtifactPackagingMapper implements ArtifactPackagingMapper {
  
      private final Logger logger = LoggerFactory.getLogger(getClass());
  
      protected Logger getLogger() {
          return logger;
      }
  
      public static final String MAPPING_PROPERTIES_FILE = "packaging2extension-mapping.properties";
  
      private File propertiesFile;
  
      private volatile Map<String, String> packaging2extensionMapping;
  
      private static final Map<String, String> DEFAULTS;
  
      static {
          DEFAULTS = new HashMap<>();
          DEFAULTS.put("ejb-client", "jar");
          DEFAULTS.put("ejb", "jar");
          DEFAULTS.put("rar", "jar");
          DEFAULTS.put("par", "jar");
          DEFAULTS.put("maven-plugin", "jar");
          DEFAULTS.put("maven-archetype", "jar");
          DEFAULTS.put("plexus-application", "jar");
          DEFAULTS.put("eclipse-plugin", "jar");
          DEFAULTS.put("eclipse-feature", "jar");
          DEFAULTS.put("eclipse-application", "zip");
          DEFAULTS.put("nexus-plugin", "jar");
          DEFAULTS.put("java-source", "jar");
          DEFAULTS.put("javadoc", "jar");
          DEFAULTS.put("test-jar", "jar");
      }
  
      public void setPropertiesFile(File propertiesFile) {
          this.propertiesFile = propertiesFile;
          this.packaging2extensionMapping = null;
      }
  
      public Map<String, String> getPackaging2extensionMapping() {
          if (packaging2extensionMapping == null) {
              synchronized (this) {
                  if (packaging2extensionMapping == null) {
                      packaging2extensionMapping = new HashMap<>();
  
                      // merge defaults
                      packaging2extensionMapping.putAll(DEFAULTS);
  
                      if (propertiesFile != null && propertiesFile.exists()) {
                          getLogger().info("Found user artifact packaging mapping file, applying it...");
  
                          Properties userMappings = new Properties();
  
                          try (FileInputStream fis = new FileInputStream(propertiesFile)) {
                              userMappings.load(fis);
  
                              if (userMappings.keySet().size() > 0) {
                                 for (Object key : userMappings.keySet()) {
                                     packaging2extensionMapping.put(
                                             key.toString(), userMappings.getProperty(key.toString()));
                                 }
 
                                 getLogger()
                                         .info(propertiesFile.getAbsolutePath()
                                                 + " user artifact packaging mapping file contained "
                                                 + userMappings.keySet().size()
                                                 + " mappings, applied them all succesfully.");
                             }
                         } catch (IOException e) {
                             getLogger()
                                     .warn("Got IO exception during read of file: " + propertiesFile.getAbsolutePath());
                         }
 
                     } else {
                         // make it silent if using defaults
                         getLogger()
                                 .debug("User artifact packaging mappings file not found, will work with defaults...");
                     }
                 }
             }
         }
 
         return packaging2extensionMapping;
     }
 
     public void setPackaging2extensionMapping(Map<String, String> packaging2extensionMapping) {
         this.packaging2extensionMapping = packaging2extensionMapping;
     }
 
     public Map<String, String> getDefaults() {
         return DEFAULTS;
     }
 
     public String getExtensionForPackaging(String packaging) {
         if (packaging == null) {
             return "jar";
         }
 
         // default's to packaging name, ie. "jar", "war", "pom", etc.
         return getPackaging2extensionMapping().getOrDefault(packaging, packaging);
     }
 }